CVE-2024-26899: block: fix deadlock between bd_link_disk_holder and partition scan
First published: Wed Apr 17 2024(Updated: )
In the Linux kernel, the following vulnerability has been resolved: block: fix deadlock between bd_link_disk_holder and partition scan 'open_mutex' of gendisk is used to protect open/close block devices. But in bd_link_disk_holder(), it is used to protect the creation of symlink between holding disk and slave bdev, which introduces some issues. When bd_link_disk_holder() is called, the driver is usually in the process of initialization/modification and may suspend submitting io. At this time, any io hold 'open_mutex', such as scanning partitions, can cause deadlocks. For example, in raid: T1 T2 bdev_open_by_dev lock open_mutex [1] ... efi_partition ... md_submit_bio md_ioctl mddev_syspend -> suspend all io md_add_new_disk bind_rdev_to_array bd_link_disk_holder try lock open_mutex [2] md_handle_request -> wait mddev_resume T1 scan partition, T2 add a new device to raid. T1 waits for T2 to resume mddev, but T2 waits for open_mutex held by T1. Deadlock occurs. Fix it by introducing a local mutex 'blk_holder_mutex' to replace 'open_mutex'.
Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67 416baaa9-dc9f-4396-8d5f-8c081fb06d67
| Affected Software | Affected Version | How to fix |
|---|---|---|
| redhat/kernel | <6.7.11 | 6.7.11 |
| redhat/kernel | <6.8.2 | 6.8.2 |
| redhat/kernel | <6.9 | 6.9 |
| Linux Kernel | >=6.7<6.7.11 | |
| Linux Kernel | >=6.8<6.8.2 | |
| debian/linux | 5.10.223-1 5.10.226-1 6.1.123-1 6.1.119-1 6.12.11-1 6.12.12-1 |
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Reference Links
- https://git.kernel.org/stable/c/03f12122b20b6e6028e9ed69030a49f9cffcbb75
- https://git.kernel.org/stable/c/1e5c5b0abaee7b62a10b9707a62083b71ad21f62
- https://git.kernel.org/stable/c/5a87c1f7993bc8ac358a3766bac5dc7126e01e98
- https://launchpad.net/bugs/cve/CVE-2024-26899
- https://access.redhat.com/security/cve/CVE-2024-26899
- https://lore.kernel.org/linux-cve-announce/2024041745-CVE-2024-26899-3f41@gregkh/T
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=2275651
- https://access.redhat.com/errata/RHSA-2024:9315
- https://bugzilla.redhat.com/show_bug.cgi?id=2275650
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2024-26899
- https://nvd.nist.gov/vuln/detail/CVE-2024-26899
- https://security-tracker.debian.org/tracker/CVE-2024-26899
- https://ubuntu.com/security/CVE-2024-26899
- https://git.kernel.org/linus/03f12122b20b6e6028e9ed69030a49f9cffcbb75
Frequently Asked Questions
What is the severity of CVE-2024-26899?
CVE-2024-26899 has a severity rating that indicates a potential for significant disruption due to a deadlock issue in the Linux kernel.
How do I fix CVE-2024-26899?
To fix CVE-2024-26899, upgrade your Linux kernel to versions 6.7.11, 6.8.2, 6.9, or the latest available for your distribution.
What systems are affected by CVE-2024-26899?
CVE-2024-26899 affects various versions of the Linux kernel, including those below version 6.7.11 and specific releases in the 5.10 and 6.x series.
Is CVE-2024-26899 actively being exploited?
There is currently no public information indicating active exploitation of CVE-2024-26899, but it should be addressed promptly due to its nature.
What are the symptoms of CVE-2024-26899?
Symptoms of CVE-2024-26899 may include system freezes or deadlocks related to block device operations.
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